CRYSTAL PALACE

CRYSTAL PALACE is a powerful software system for crystal orientation
and Laue pattern plotting written by Dr. Preuss and his coworkers.
See J. Appl. Cryst. (1995). 28, 660

The recognition of an unknown crystal orientation
is based on the visual comparison of the experimental Laue pattern
with the computer plot simulation of this pattern. The simulation includes the
intensity of the Laue spots as well as the extinction of
spots by interference, which is obtained by the structure factors in the
program. The program can be run without any structure factor also,
plotting all reflections.
This may be used in the orientation of crystal planes which give no
by interactive data input until the approximation is nearly perfect.

There are different methods available for the
orientation of a crystal in a special crystallographic direction. The
rotation angles for the orientation of a crystal in a special
crystallographic direction opposite to the incident X-ray or neutron
beam can be obtained by different
ways. Firstly, the rotation angles can be read off the scales in the
plots. Secondly, they can be calculated by a program named CPORIENT in the
program package. This program has a similar menu driven interactive
data input as the plot program. And thirdly, the calculated rotation
angles are given out into a separate file. The Laue spots are
designated by the Miller indices in the plots. The Miller indices are
the reciprocal sections of the reflecting crystal planes with the
three main crystal axes.

CRYSTAL PALACE runs on IBM AT compatible computers from 80286 processor and
MS-DOS 3.3 or higher, a version for UNIX-Systems is available also.